The general trend that is shown on the graph is that average surface temperature on earth

Option B

Explanation:

Option A is incorrect because the temperature has risen continuously from 1880 to 2000. However, this rise in temperature has been very marginal numerically thus option D is also incorrect. Option c is incorrect because in the graph temperature has risen in 2000 instead of dropping.  

Over all the temperature of surface of earth has increased from near to minus 0.2 degrees in 1880 to near to 0.6 degrees in 2000. The temperature has increased by nearly 0.8 degrees. Thus, it can be said that the average surface temperature of earth has increased by 1 degree.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation: